System and Method for Estimating Cardiac Pressure Based on Cardiac Electrical Conduction Delays Using an Implantable Medical Device

a technology of electrical conduction delay and cardiac electrical pressure, which is applied in the field of implantable medical devices, can solve the problems of long delay and associated with worsening cardiac status, and achieve the effects of reducing venous return, rapid pacing, and precise calibration
US20090287267A1Active Publication Date: 2009-11-19PACESETTER INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
PACESETTER INC
Publication Date
2009-11-19

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Abstract

Techniques are provided for estimating left atrial pressure (LAP) or other cardiac performance parameters based on measured conduction delays. In particular, LAP is estimated based interventricular conduction delays. Predetermined conversion factors stored within the device are used to convert the various the conduction delays into LAP values or other appropriate cardiac performance parameters. The conversion factors may be, for example, slope and baseline values derived during an initial calibration procedure performed by an external system, such as an external programmer. In some examples, the slope and baseline values may be periodically re-calibrated by the implantable device itself. Techniques are also described for adaptively adjusting pacing parameters based on estimated LAP or other cardiac performance parameters. Still further, techniques are described for estimating conduction delays based on impedance or admittance values and for tracking heart failure therefrom.
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Description

RELATED APPLICATIONS

[0001] This application is related to U.S. patent application Ser. No. ______ (Attorney Docket No. A07P3015-US1) of Wenzel et al., entitled, “System and Method for Estimating Cardiac Pressure Based on Cardiac Electrical Conduction Delays Using An Implantable Medical Device,” filed concurrently with this application. This application also claims priority on U.S. Provisional Patent Application No. 60 / 910,060 of Wenzel et al., entitled, “System and Method for Estimating Left Atrial Pressure based on Intra-Cardiac Conduction Time Delays,” filed Apr. 4, 2007, which is fully incorporated by reference herein.FIELD OF THE INVENTION

[0002] The invention relates generally to implantable medical devices such as pacemakers and implantable cardioverter defibrillators (ICDs) and in particular to techniques for estimating cardiac pressure (particularly left atrial pressure (LAP)) to detect and evaluate heart failure and related conditions and to automatically adjust pacing param...

Claims

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